Adjustable sighting device for archery bow

ABSTRACT

An adjustable sighting device which may readily be attached to all types of bows is described. A movable sighting element carries a front bead and a back bead for aiming. The sighting elements are attached to a carrier block engaged over a lead screw for fine adjustment. Means are provided for rapid disengagement of the carrier block for coarse adjustment of the height of the sighting element.

United States Patent 1191 Brougham Mar. 18, 1975 ADJUSTABLE SIGHTINGDEVICE FOR ARCHERY BOW Inventor: George D. Brougham, PO. Box 37,

RD. No. 2, Gillett, Pa. 16925 Filed: Feb. 14, 1974 Appl. No.: 442,381

Related US. Application Data Continuation-impart of Ser. No. 381,252,July 20, 1973, Pat. No. 3,849,894.

US. Cl. 33/265, 33/165 Int. Cl. F41g 1/46 Field of Search 33/265, 165

References Cited UNITED STATES PATENTS 7/1884 Winn ..33/165 2/1893 Nutt..33/165 2,893,124 7/1959 Sundquist 33/265 2,959,860 11/1960 Kowalcyk...33/265 2,982,026 5/1961 Peterson 33/265 FOREIGN PATENTS OR APPLICATIONS1,345,697 11/1963 France 33/265 Primary ExaminerRichard E. AegerterAssistant Examiner-Richard R. Stearns [57] ABSTRACT An adjustablesighting device which may readily be 2 Claims, 4 Drawing FiguresADJUSTABLE SIGHTING DEVICE FOR ARCHERY BOW This application is acontinuation-in-part of my pending application, Ser. No. 381,252, nowUS. Pat. No. 3,849,894 filed on July 20, 1973.

BACKGROUND OF THE INVENTION In archery, aiming is one of the mostdifficult things to execute. The technique varies with the individual,some utilizing the tip of the arrow as a sighting aid and othersconcentrating both eyes on the target. The first of these techniques isgenerally referred to as the gap system, or point of aim shooting, andthe other is known as instinctive shooting.

It has long been recognized that following the principles of the sightsof a rifle, bows may also be equipped with mechanical aids in the formof sighting devices. A variety of these have been suggested in the pastsome rather simple and others of complicated form.

Mention is made here, for example, of U.S. Pat. Nos. 3,056,206;3,488,853; 3,212,190; and 3,579,839, representing a variety of bowsights, each having the common purpose of aiding the archer in scoring.

The present invention is directed toward improving the ease of handlinga bow and the accuracy of hitting the target used in archery or for thepurpose of hunting. It consists of an adjustable sight which may beeasily mounted on the bow and readily adjusted by the user for thedistance desired.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a view showing thesuperposition of the face and back beads for sighting.

DETAILED DESCRIPTION OF THE EMBODIMENT:

As seen in the figures, the bow sight construction comprises a housing11 which may be conveniently mounted by screws 12 and 13 onto the side15 of the bow which is opposite the sight window 16.

Placed within the housing 11 and rotatably mounted in bearings 18 and 19is a lead screw 20 having a shaft 21 extending downwardly andterminating in a knurled knob 23.

A carrier block 25 is loosely fitted over the lead screw 20 for ridingup and down. As will be seen, the block 25 carries the head support bar26 affixed thereto by means of the bolt 27.

In addition, the block 25 has a laterally-extending member 29 to whichis affixed the L-shaped locking lever 30 pivotally mounted over the pin31. The shank of the lever 30 is biased by the spring 33 nesting in abore of the carrier block 25.

The lower extremity of the lever 30, indicated by reference 34, has athreaded face 35 matching the thread of the lead screw 20. The spring 33maintains engagement of the face 35 with the lead screw 20.

Referring to FIGS. 2 and 3, it is seen that the bar 26 carries asighting bead at each end, namely, the face bead 38 and the back bead39. The beads consist of solid spheres supported at the end of pins. Theface bead 38 is affixed to a pin 40 bent at an angle and mounted in athreaded rod 41 ofa larger diameter. The latter fits into a similarlythreaded bore of the support bar 26. A lock nut 43 is provided forsecuring the rod 41 against turning. The effective length of the rod 41with respect to the bar 26 may be adjusted by loosening the lock nut 43and turning the rod 41 inwardly or outwardly so as to place the bead 38in proper alignment with the shaft of the arrow 45 placed on the arrowrest 46.

The back bead 39 is similarly constructed, the component elements beingindicated by like reference characters bearing primary indices.

The pin 40, as well as the pin 40', are bent at an angle so as to fallin line with the face bead when properly adjusted and thus form a lineof sight for aiming purposes. FIG. 4 illustrates the appearance of thesighting device when the beads 38 and 39 are superposed. In practice, aslight positional difference between the beads allows the correction ofparallax in sighting inasmuch as the face bead 38 is closer to the eyeof the user than the back bead 39.

The sighting device herein described is extremely simple to use andprovides great accuracy.

At the start, the bow is firmly held by the user and the carrier block25 is set at a particular selected position. This may be effectedquickly by pressing down on the locking lever 30 at the place where itis engaged by the spring 33. The lever 30, pivoted over the pin 31, isthus displaced so that the threaded face 35 of the extremity 34 isdisengaged from the lead screw 20. The carrier block 25 is thus free toslide over the lead screw 20 in any desired up or down position for theapproximate aiming distance needed for the arrow to hit the target. Thisoperation represents the coarse adjustment.

Upon release of the locking lever 30, the spring 33 places it intothreaded engagement with the lead screw 20. Fine adjustment for verticalmovement of the carrier block 25 may then be obtained by turning theknurled knob 23 in either direction so as to lower or raise the carrierblock 25. Since the latter carries the support bar 26 to which the beads38 and 39 are affixed, the desired position of these may be accuratelyset.

The angular displacement between the beads 38 and 39 may then beestablished by loosening either of the lock nuts 43 or 43 and turningthe rods 41 and 41 in order to obtain the superposition of the beads forthe correction of parallax as well as to provide an alignment foraccurate sighting of the target at the distance determined by theposition of the carrier block 25.

In practice, the face bead 38 is sighted in on the target first and thenthe back bead 39 is lined up with it. Both beads are lined up over thecenter of the arrow 45 and sighted in for the shortest range. Thevernier adjustment by means of the knob 23 can then be used for trimmingand setting.

The invention in its broader aspects is not limited to the specificembodiments herein shown and described but changes may be made withinthe scope of the accompanying claims without departing from theprinciples of the invention and without sacrificing its chiefadvantages.

What is claimed is:

slideably mounting said carrier block on said screw, and beingdimensional to cooperate with said channel housing to prevent rotationof said carrier block with respect to said lead screw;

. a support bar mounted on said block transversely disposed with respectto said housing, said bar carrying a sighting bead at each end;

h. an L-shaped locking lever mounted on said block and pivotallysupported thereon;

i. said lever having at one end a threaded face portion engaging saidlead screw and, at the other end, a shank in contact with a biasingspring. tending to maintain said face portion in engagement with saidscrew, whereby, upon manually depressing said shank, said face portionbecomes disengaged from said lead screw, allowing the free movement ofsaid carrier block over said screw for coarse adjustment of the heightof said bar and, upon releasing the pressure from said shank, engagementthereof is effected, permitting fine adjustment of the height of saidbar by the turning of said knob.

2. A bow sight in accordance with claim 1 wherein each sighting beadscomprises a solid sphere attached to a pin member affixed to andextending at an angle to a rod threadably supported in said bar, whereinupon rotation of said rods, said beads may be displaced relative to eachother to be superposed in the line of sight to the extent desired forthe correction of parallax.

1. An archery bow sight adapted to be mounted on the side of a bow,comprising: a. an elongated channel housing having a U-shaped crosssection defined by a bottom wall and side walls; b. mounting means forattaching the housing to the bow; c. an elongated lead screw disposedlongitudinally within the housing having a shaft extending therefrom; d.a knob affixed to said shaft; e. bearings mounted on the respective endportions of said housing for rotatably supporting said lead screw; f. acarrier block having an opening therethrough for slideably mounting saidcarrier block on said screw, and being dimensional to cooperate withsaid channel housing to prevent rotation of sAid carrier block withrespect to said lead screw; g. a support bar mounted on said blocktransversely disposed with respect to said housing, said bar carrying asighting bead at each end; h. an L-shaped locking lever mounted on saidblock and pivotally supported thereon; i. said lever having at one end athreaded face portion engaging said lead screw and, at the other end, ashank in contact with a biasing spring, tending to maintain said faceportion in engagement with said screw, whereby, upon manually depressingsaid shank, said face portion becomes disengaged from said lead screw,allowing the free movement of said carrier block over said screw forcoarse adjustment of the height of said bar and, upon releasing thepressure from said shank, engagement thereof is effected, permittingfine adjustment of the height of said bar by the turning of said knob.2. A bow sight in accordance with claim 1 wherein each sighting beadscomprises a solid sphere attached to a pin member affixed to andextending at an angle to a rod threadably supported in said bar, whereinupon rotation of said rods, said beads may be displaced relative to eachother to be superposed in the line of sight to the extent desired forthe correction of parallax.